Valve for hydraulic brakes in guns with recoiling barrels.



E. OLSSON.

VALVE FOB HYDRAULIC BRAKES IN GUNS WITH RECOILING BABRELS.

I APPLICATION FILED NOV. 12, 1909. 1,029,555.

Patented June 11, 1912.

2 SHEETS-SHEET 1 WITNESSES vfmwm E. OLSSON. VALVE FOR HYDRAULIC BRAKESIN GUNS WITH REGOILING BABRELS.

APPLICATION FILED NOV.12, 1909.

Patented June 11, 1912.

2 SHEETB8HEET 2.

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COLUMBIA PLANOOHAPH co.,\vAsmN0'roN, n I

UNITED STATES PATENT OFFICE.

EMIL OLSSON, BOFORS, SWEDEN, ASSIGNOR T0 .AKTIEBOLAGET BOFORS-GULLSPANG,

OF BOFQRS, SWEDEN, A TJIMITED COIVIPANY.

VALVE FOR HYDRAULIC BRAKES IN GUNS WITH REQOILING BARRELS*.,

Application filed November 12, 1909. Serial No. 527,677.

To all whom it may concern:

Be it known that I, EMIL OLssoN, chief engineer, a subject of Sweden,residing. at Bofors, Sweden, have invented new and useful Improvementsin Valves for Hydraulic Brakes in Guns with Recoiling Barrels, of whichthe following is a specification.

The present invention relates to an arrangement in such hydraulic brakesfor guns with recoiling barrel, which-are pro. vided with a hollowpiston rod embracing a controlling *rod, and where, in elevating thegun, the recoil is shortened by rotating, automatically or by hand,either the piston rod or the controlling rod, the purpose of theinvention being tofcontrol, simultaneously with the recoil length, alsothe passage areas for the braking liquid during the counter-recoil, sothat in a horizontal position of the barrel axis a greater resistanceagainst the counter-recoil may be obtained than in an elevated'position,when the propelling force is reduced by the action of gravity. The saidpassage'areas can also, be automatically varied during, thecounterrecoil. These purposes are effected by means of a special valveprovided on the front end of the controlling rod and so arranged,

that it will admit the braking liquid freely into the interior of thepiston rod during the recoil, but will force the same liquid during thecounter-recoil to pass openings, the size ofwhich is controllable theabovementioned way.

The invention is illustrated in the accompanying drawing where- Figure 1shows a'recoil brake in a side view with the front part in longitudinalsection, showing the construction of the valve in question, Figs. 24cross sections on the line AA in Fig. 1 with the Valve in differentpositions, Fig. 5 shows a partial sectional elevation of the gun in asmaller scale, illustrating means for automatically rotating the pistonrod when the elevation of the gun is changed, Fig. 6 a partial crosssect-ion on the line BB in Fig. 5, and Fig. 7 a cross section on thebroken line CO in Fig. 5.

The piston rod 1 (Figs. 14) is rotatably connected to the cradle 9. Thebrake cylinder 3 surrounding the piston and piston rod and thecontrolling rod 2 plunging into the interior 7 of the hollow piston rodare rigidly connected with the lug 14: of the barrel. On

Specification of Letters Patent.

Patented June 11, 1912.

the front end of the rod 2 a valve 4 in the shape of a disk is providedso as to be rotatable and longitudinally movable on the rod and adaptedto rest, duringthe counter-recoil, against a disk-shaped seat 5 securedto the rod 2, but to take positiona't some dis tance from the said seatduring the recoil. The valve disk is provided not only withcomparatively large openings 10 adapted to cooperate with correspondingopenings 11 in the seat 5 for admitting more or less liquidcorresponding to the mutual angular position of valve and seat, but alsowith smaller openings 6 arranged to admit liquid independently of theposition of the valve. The latter is guided by means of projections 12in straight or suitably curved grooves 13 in the piston rod 1.

On the piston rod 1 a tooth segment 19 is fixed, said segment meshingwith a pinion 20 on a shaft 21. The latter is capable of being rotated,by means of a bevel gearing 22, 23, from a shaft 24 journaled in thecradle 9 and carrying, atits outer end, a lever 25. A pin on the end ofsaid lever is guided in a grooved piece 26 secured to the carriage ofthe gun. The shape .of the groove is such, that in elevating the gun,the lever 25 is rotated together with shaft 24, thus also rotating, :bymeans of the described mechanism the piston rodlf, whereby the recoillength may be varied simultaneously with the elevation of the gun, as,for instance, in the manner set forth in my United States Letters PatentNo. 997,411. During the recoil of the. gun liquid from the pressure sideof the brake cylinder is forced into the hollow piston rod and flowsthrough channels 15 provided for this purpose in the controlling rod 2in the direction of the valve. The liquid presses away the valve 4,which is stopped by the nut 16 (position shown in dash and dotted linesin Fig. 1), whereupon it flows through the openings 11, the clearancebetween valve and seat and the openings 10 into the interior space 7 ofthe piston rod,-which thus is filled with liquid. When the recoil isended and the counter-recoil begins, the valve 4 under the pressure,which new acts in the opposite direction, resumes its position againstthe seat 5, whereby a more or less total closing of the valve iseffected, depending upon the mutual angular position between valve andseat.

When the barrel is elevated at small angles, the aforesaid angularposition is such that liquid during the counter-recoil is admitted onlythrough the small openings 6, but when the elevation is increased andthe piston rod 1 simultaneously displaced angu larly in relation to thecontrolling rod 2 for adjusting the recoil length, the valve 4 is alsoturned by means of the grooves 13 and projections 12, so that upon acertain angle being reached, the openings 10 and 11 will register toform admitting areas a, the size of which can be increased at will bymaking the said openings 11 and 10 of suitable shape (Figs. 2-4). Bythis means the hydraulic resistance against the counter-recoil of thebarrel can be controlled according to the propelling force, whichdepends upon the elevation, so that the motion takes place with suitablespeed. By making the grooves 13 suitably curved the areas a can beautomatically varied during the counterrecoil.

Having now particularly described and ascertained the nature of my saidinvention,

' and in what manner the same is to be performed, I declare that What Iclaim is:

l. A hydraulic brake for artillery guns with recoiling barrel,comprising in combination, a brake, cylinder, a hollow piston rod, acontrolling rod embraced by the same, means for rotating one of saidrods relatively to the other when the elevation of the gun is changed,means for admitting liquid into the hollow piston rod, a valve arrangedon the end of said controlling rod embraced by said piston rod and meansfor guiding said valve in the piston rod so as to change during thecounter-recoil, the passage areas for the liquid through the interior ofthe piston rod in accordance with the mutual angular position of saidpiston rod and con trolling rod.

2. A hydraulic brake for artillery guns with recoiling barrel,comprising in combination, a brake cylinder, a hollow piston rod, acontrolling rod embraced by the same, means for rotating one of saidrods relatively to the other when the elevation of the gun is changed,means for admitting liquid into the hollow piston rod, a valve memberand seat on the end or" the controlling rod plunging into the hollowpiston rod, said valve member being rotatable and longitudinally movableon the controlling rod, projections on said valve member engagingguiding grooves in the piston rod, and coacting openings in said valvemember and seat registering more or less according to the mutualrotation of said piston rod and said controlling rod.

3. A hydraulic brake for artillery guns with recoiling barrel,comprising in combination, a brake cylinder, a hollow piston rod, acontrolling rod embraced by the same, means for rotating one of saidrods relatively to the other when the elevation of the gun is changed,means for admitting liquid into the hollow piston rod, a valve memberand seat on the end of the controlling rod plunging into the hollowpiston rod, said valve member being rotatable and longitudinally movableon the controlling rod and guided in the piston rod, openings in saidvalve member cooperating with openings in the valve seat during thecounter-recoil for admitting more or less liquid depending upon themutual position of the valve member and seat, and additional smallopenings in the valve member cooperating with the openings in the seatto admit a constant quantity of liquid.

In testimony whereof I have signed my name to' this specification in thepresence of two subscribing witnesses.

EMIL OLSSON.

Witnesses:

BIRGER NORDFELDT, H. TELANDER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

